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Moelo, Y., Orlandi, P., Guillot-Deudon, C., Biagioni, C., Paar, W. & Evain, M. (2011) LEAD-ANTIMONY SULFOSALTS FROM TUSCANY (ITALY). XI. THE NEW MINERAL SPECIES PARASTERRYITE, Ag4Pb20(Sb14.5As9.5)(Sigma 24)S-58, AND ASSOCIATED STERRYITE, Cu(Ag,Cu)(3)Pb-19(Sb,As)(22)(As-As)S-56, FROM THE POLLONE MINE, TUSCANY, ITALY. Can. Mineral. 49 623–638. 
Added by: Laurent Cournède (2016-03-10 21:32:21)
Type de référence: Article
DOI: 10.3749/canmin.49.2.623
Numéro d'identification (ISBN etc.): 0008-4476
Clé BibTeX: Moelo2011
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Catégories: MIOPS
Mots-clés: antimony, Apuan Alps, arsenic, crystal-structure, definition, della-vena mine, Italy, lead, new mineral species, northern apennines, owyheeite, oxy-chloro-sulfosalt, parasterryite, Pollone mine, refinement, silver, sterryite, sulfosalt, tuscany
Créateurs: Biagioni, Evain, Guillot-Deudon, Moelo, Orlandi, Paar
Collection: Can. Mineral.
Consultations : 9/327
Indice de consultation : 2%
Indice de popularité : 0.5%
Résumé     
{The new mineral species parasterryite has been discovered in the Pollone barite - pyrite -(Pb-Zn-Ag) deposit at Valdicastello Carducci, near Pietrasanta, in the Apuan Alps, Tuscany, Italy. It forms acicular crystals up to 4 X 0.3 mm in vugs in quartz-barite veins. Sterryite (second world occurrence) also is present. The associated sulfides and sulfosalts are pyrite, sphalerite and various Sb-As sulfosalts. Parasterryite is black and metallic. Under the microscope, it is white with weak pleochroism; anisotropism is distinct, with greenish and brownish tints. Data on maximum and minimum reflectances for the COM wavelengths are [lambda (nm), R-air, R-oil (\%)]: 470: 35.1, 40.8 and 19.4, 22.2, 546: 33.5, 39.3 and 19.3, 21.7, 589: 32.7, 38.2 and 18.7, 21.1, 650: 31.4, 36.5 and 17.3, 19.5. Hardness VHN10 = 238 kg/mm(2). An electron-microprobe analysis gave (in wt.\%, mean result of 32 spot analyses): Cu 0.09(2), Ag 4.36(6), Hg 0.15(2), Pb 47.00(18), Sb 19.57(30), As 7.73(21), S 20.56(7), total 99.46(23). A single-crystal X-ray study of parasterryite indicates monoclinic symmetry, space group P2(1)/c, with a 8.3965(5), b 27.9540(4), c 43.8840(13) angstrom, beta 90.061(12)degrees
Added by: Laurent Cournède  
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